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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3fe6e5cb6cee4599480e72983199bb87f26447c5bc25983c9ec879b48be40d' 
  AND token = 'FYUHNk/YpSV7Vsr9yiTIA+Ia6n8f+hvnEHICH7Xvx3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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