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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f36103828a65a48e8ed7e0cb7fa62d9aeaaa8ca5a8733b8ff5164c38335236f' 
  AND token = 'NsUjOwPe3QpGftYeajTXMzeLuKQ5E57yaWuSOIaZBcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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