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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2342aa50487fc487b354b3f08820d96a1130a88c7325b4e6fb365b6c40421260' 
  AND token = 'Re1vA5awVL2nQ10wzyESloN+RysgeK4MFOZQkh7d52Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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