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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7344ccf47ec2397b693c472cc9d86a5ec4025f5404179665652b905b308df492' 
  AND token = 'T7PIXU5HXLvItCScGEc3L/N9AxoqF2cs7Nm+RWzK9us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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