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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92394ea85588e1623b01c8fe974777d107fa9bae8fa8cfd47d8427509dab7b3' 
  AND token = 'jxsQJi9qSFKy38VHs9K1psswK/c4aERbX1J7gkLyDo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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