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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99824118bf432ce53c75649fc6f91432ccb953f491d2acc89a6e2934a7f2944a' 
  AND token = 'ZlJ9CZQUPzTk01CQPsjvumIncjkuW8ZC5or405Uln64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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