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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a55ae503e96086e697805be12f6185bea08a5a397c098b18484aef37bd279f' 
  AND token = '0PV4Drvk/6sQnrOXw/IwTTmF5b4YEjCDNLaldE2g1Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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