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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e439f2a050e8c8ea73043a0e59393afb6adf9b523ce74ff5089d58fd85806d7' 
  AND token = 'HakYkTyLx15NhWmHzVVdoGYY/9DZnKroOXU5JIvrefY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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