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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2b1fcb969b536cbb6c7e7e5821f65988e3ac4f60839583f439c3d3f83568be' 
  AND token = 'zs/7aG3oks4tuap+6wwmdt9eIOai4cyUatm6Nxt5gdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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