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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdc538d883027ecf0389cafb55c73d246b9c7671558bd73d6437b2d509dc3d0' 
  AND token = 'TEi6CTk8JMOanz+FX5aa4prdy+kWyycdxLde3JFWLrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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