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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dc9d8b7e2c54ee0ab215f29a2f87d03807561d7c193d76895552bd9634b65d' 
  AND token = '8fN4VOfJGaHY9zfO8a34HNIC/62P+7lBtN3KLhGz89I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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