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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417d1b9a3b22349202981031ddb8bfc565ea8ed5dbf387f33090524bb0a9b5f5' 
  AND token = '10b5tk0TGKkR5O9kgxDwlD7GiuKS3hr1Spsba/oobJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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