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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad386c3c11e1450cca48a7aa65311b8aec5e772fa8e5f8ff964f5ecf98abee0e' 
  AND token = 'e/0r2prNEfP9Y7rtWYhoQDO683Po8OWJzf1sYzAuasY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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