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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dd99a54daf95bf136278dc547c10a347dd277a49ae17ab6f1e3b4107461d56' 
  AND token = 'EtSpkSIluOYTRfFYkQdC8OToSVuBcPLlNuqs+73A5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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