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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0854dce1a14ddbdbd1d8308328a9028d71308218bf42562cf3f5669c5ac6780' 
  AND token = '1aQChJ1doCKRBYEOLAzsK9iA4JCtmp8ZVwA21r/o8RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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