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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec4d36d96d710dc8351f91c09adbc924f593e042336c626bd4fabfbd59509b2' 
  AND token = 'lUKw98K4nXb5X8udLN5naN+MScmdqck3mUxRDlM3fjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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