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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c597070d024e13a275f9da5edb1a9aef4a07fb36646457a88843a42deb3cab' 
  AND token = 'UnZGxZkcFSe3lr1SLasB+lkaa37mUa3MbxtDyH+yoU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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