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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1479d4db7af25efa00fba63c2c338bd46644b106b50fd7a20458238e8e024366' 
  AND token = '5KTIvXs7RyE1kk/r3mVyD4AvpcTE++Oo/8xfLq00r6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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