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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3914ec7cb92416d8a60980e1acd97de507a2efd303e06060936823173f550c' 
  AND token = 'cfayr4SppBfsT+Xv73C9fhoUqmdottKCfOmJLUrkfzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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