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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9896a44d1db39aaafd89436f1c7fd924d9a353e8443b912d748a11feb1c56b3c' 
  AND token = 'eMUyUuZ21ltEG5OvSP4VD5at1eGHTNbEJZTuQsAi5jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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