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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61d9c9ac6b7a2c552109c90c6ab7604b9e4adda403c13e124e8c23b1f37f736' 
  AND token = 'j0CXkH0F1TeebEBxpE+a3h0WTBdGt/tnRBf5aHk0hAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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