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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99db45f521fcf3b059072f91e81614de4de86a49842046c450167563331182fc' 
  AND token = 'lKwiog2ccJtrbnLVM7MBuz4Kd13Y0wGZ800zWnCmfns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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