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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e3788c318ae926396bdf2cc2ed68baea8160dbc6ab87588bcde11f0682524e' 
  AND token = 'Gqv7Ci1oBt609hPJqq9YIAW6YGMeEZwN01BrOEFKRB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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