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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68b77b19c99a6e90dc93100ffd0b82324f2dbb135ccdddc582baeede8486a77' 
  AND token = 'XEu5SpSl9tehnG7KjpGaVls+QxqpL9Vw2o4yIO1p7Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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