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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff19dc6feebe7342d69a9ef3447e1e18b072b09020a1fc0703fc7d33483b2b5c' 
  AND token = 'kBZkDtRjRrhYvxwGaE6JML+OHaKj5tfIvccJANSJJRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}