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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2322be1c1a2fdb0d20410538b96bd5f08dd380dc45b71781ebfe9dfddbe4a0db' 
  AND token = 'KL4yBj7iar5ZOPq8sXRDrr38zbatpDwC9XQSdAznKPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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