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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529c64b6ae6c2f798d7352938bc322b02cb0c1c441620b5c1d3768e99980e7c1' 
  AND token = '+kgaCSNVIz7zD8aBoN9HDheHDqXMqULZeJuLNzaEOv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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