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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7e4fc04bb6f7a244b207cba05ee3c73b0dc95629803b3ed67a14d4ebf6cea6' 
  AND token = 'SHSWxx6i6EM1wOdt2LtO7Wk14LnhOUW3zKpjYZErS2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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