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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e3adc1c0f8e6e41d582f9ad875754ffbc40a08ca510066ed8a091e21a90bcc' 
  AND token = 'zsE9c4ptiOdUUXg0hgkakGWOzVJDayWFnsS3KSPM5UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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