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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11f9b898928e61d4794550700253c6fa3fd1599fff8a18441cd5ce5b2595261' 
  AND token = 'ovisNZWPyhwpeRXDIGbftRDhQIkemMWdzZUR9lMTSuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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