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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f30f968e0637025590ec3202611fa9895027d37ab9001d18277fa2d27794b6e' 
  AND token = 'yM9E7ecX2azyM1yqO83KmW0mBZd4aSvRR+zBBlxOG5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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