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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd95955123a7d382842b2d1584e04f0f402175f7d54210e4ca6642943328d9df' 
  AND token = 'j31BKOT4SG52YySkwVCyB7P1fuC/yukQ/2ahCz5D580=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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