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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63fbe4f243202f09f253af26fbbf698b3a175447f76229ea9286aff83c2d0d0' 
  AND token = 'oCqyUSz5nLmnZP7ILbjkjneOxT0XxKsfVoA0MEqKDOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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