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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941788366a37a36f21eedb8d0c8329d758151e8ad7882ecc350e36e0845dca49' 
  AND token = '/fTKc2NaQq/kPigwDzUqjOHW3xP3sb3L3vBqwX6+W98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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