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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d350368734bf3b17a4801ac2607179db4e1e4e82febf89e00c1c9a879021b9d' 
  AND token = 'dSwoscj/hRu6Lmta8xCakT4QVVosOOsUjKWPYYahp60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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