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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6daa793bfc99796c1da0c18e704162d66669c13d5d4a834eea7b6d1f1c2b1ba' 
  AND token = 'WEL23c0IpmOrOhC2GEFqxVdtvNDlrei4e83RtfhjIz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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