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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d27c8986f62f15270ee679c8bd45a37a991a75740d3f38662f0a82cd84457c3' 
  AND token = 'LCeBFiS0rq9gZziC1spZIxV8jjKc5dpEvV78yNStLX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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