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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269ec709558ca239ce6c9b8106bc45a6b5fe9c45f5a295d3257fcf7e8cd958ca' 
  AND token = 'ycm8EdV3sSHS8yGgrLkfy11jE2FtFtkG8nRfpOVBK8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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