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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825432a35830fe182706fee36f8de88fb1811baa9fdeaebf5e4af25691b5b4cf' 
  AND token = '4y/KFURch7TaBM03iLiVWEntCZJLkzibbHSiP1piaa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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