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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9a214355d9fe34a070891b550cccc9b30c6271686ba38399f70735a13e8651' 
  AND token = 'ERAHvq1PDQEXypqqsNO9+RwZB8YufMsrraS00Xln6HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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