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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed35cd9bf13486b497f81fd962ddf8c37c09a6b69585af6c4681c73dea062491' 
  AND token = '9iNUfpXH9tyDRbeZa/9s8WJTabhrRe0rFi3Z0aEQOs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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