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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b33f63c131a10ad83c965077a3d9037b9f87d7c5115862037aeb9bf5951bea' 
  AND token = 'Azl23+R/wPkifOab+6fo15qgP9vL5ryCxyPw14lwPWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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