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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6baadc4c7bc5714d7e92cc8c747ace22c8a03dd2c677bc3e6016cbe0c61d452' 
  AND token = '6AFt1cyvfrGhwpJTt6FG0O91KUWsft5r7gyjOFVDF98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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