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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2d9b2aea43609fb426317aa6348c43a017043a4fdd7ff693f4ffe9e71bdc2f' 
  AND token = '6lcpIE0pGEgELv/Ydl/6X8PEPIMFDwrpHsZrKUPyTU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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