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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7359bd33cf0d583845bb82c8bd5ea7247b17c414728c8bf0623de44f0dd94a1' 
  AND token = 'Hsx06AuoGRbDz3FkswHAGsXvnp9t2GTp6V7mq3JKkec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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