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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902bdd2f724cfe784d11bc16f66878bd716a35b8f4faf96f121cb3bae6cd65cd' 
  AND token = 'ibj2ueDMM3uV95E6UOCtQ/BWSxRa7JAfNj9MZoHfJxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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