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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe8964c4037956ff36fbf666009a480ec5d8db9f721d529a6a8760b7bf89e9a' 
  AND token = 'ZrWfgMU2bxkQQlv4TiooVuRq6U/WvABbjWlR37wwABc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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