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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ddd68427ee690d812df954b7b72ad117d7768a8c73443cbbd28f47bd300962' 
  AND token = 'UsUueMj/1wypqFvIMZptorL70X5kCR+yx2lkUojZ5cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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