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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c798bf53667cd8457c19ef7ce90f3cbe0cd966b7906d474e3907c452a1bb5fc6' 
  AND token = 'QeEmLAkyweDYI7f8DA20GjngG1O/rNbeDgXJUr/Oq4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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