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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ccb5f0db96247f766c1557cd76c74e1c2f1130bd0abc2e2febb63e6c6483cc' 
  AND token = 'RNhJPfpK0RY23kxI9RXIU0X35O2R5J4aOqKnjAF277A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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