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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb259f80577f02c98c4625e849261353028678c168ea03e7fd6d254fa8eda70' 
  AND token = 'odR/tA4mSLRPVVn++z5BOI/xTiLqaCsCvISz9kQcu/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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