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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bf978fa74c7d7e87e91e21b79e765159cb8ae4ab13ca450a47de926da36df2' 
  AND token = '0owg0HQp0UscrZTG07qFrPYa9PzQGfyb0/5KHSZSqIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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