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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c392f7c5776588b7c1ce5e747ddece333d442606eb738dfa8edf12cb5c5ccab' 
  AND token = 'QOMab5bF9SlxIY3N3B1puPtSh4hF6hDJptCt/1UGkvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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