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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c448531bcda605b755a8103ffbb7a5329ba01ba3ebbe175094401adb9cc244bb' 
  AND token = 'OGeGR6fEfLcXT/4wjEx4Hvru+0vz0FIVTTpE8EYdSi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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