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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc56bd68b93e1dd1b0dc7ab026c1d09159ec47761f803175e6ad512bf4110df9' 
  AND token = 'yeTdkHRPhkw8cenkxL86VjgK7J5tHI+R2wiHCzd4oqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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