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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae26ab0173c77617e6361582734cf70c7ded1d6a2329b3d9317ded7b5f6ac5a9' 
  AND token = 'Qt43XNQ8yeTedhkGUJz8ft1SltEQsGYI+KUT02xshHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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