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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98bb5ac31f600e81a772d00f8d93552f219fb6ac850bb2fc1c09facaf0f6bf3' 
  AND token = 'xB4rx1uju2dVOFrw2A301eZ06hGpjRTJiinAPuFF99c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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