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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb8175316e518721ca527de9b8641e7961e6116d44b942592673bf417946d6f' 
  AND token = 'lsQCjy18G5CWVlxVHbnuM+eoemA+kb5oy+5y8ETbpVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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