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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb677c87a162328038f90336ea9aa155d88deee77952185c038bfe128d9343a' 
  AND token = '/a5nN4MmSKhRCTtGtLIXghjsSuIKiEyf8auEA4Bdyh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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