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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddb4f2b09c050cb510dc3ebce85cd4c1240c8a173ec1ebd715ed08abbb3c19a' 
  AND token = 'xlhW0yyE7tSBfF2TNwQM6tSN4W8ZKxfQoLTmN+9bqKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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