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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ea6c0817d2c75c979b4f2f3621c0b8a15db22b479d1a80cd1db5b8ecfd374e' 
  AND token = '4AX7iCRvpapwYOuR+8PzVr7tdPzFHfVCj62qUIFlR90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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