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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213619dd55dc862307a7e6ac47cd22cfe3c7cb1d9043cefb397dc1b336e342d2' 
  AND token = 'ijaetinfxwJCB3tPdgzr6YNH9Rq0EAfl/Sc++YMWrOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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