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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4aba6c501df26e752e953d40773b564560f6bcac5285d319f02e100c0c719e' 
  AND token = 'dAjaMNg6XKmjRmHkjey0YjE82VF6vRYbl6N1SloLjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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